Profile grinding or polishing machine



Feb. 12, 1952 DYER ET AL 2,585,376

PROFILE GRINDING OR POLISHING MACHINE Filed Feb'. 24, 1950 18 Sheets-Sheet 1 & NN

Feb. 12, 1952 T. DYER ETAL v PROFILE GRINDING, OR POLISHING MACHINE l8 Sheets-Sheet 2 Filed Feb. 24, 1950 9 FIG.2A.

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PROFILE GRINDING OR POLISHING MACHINE Filed Feb 24, 1950 18 Sheets-$heet 6 yen for: free en 7 y Feb. 12, 1952 F. T. DYER ETAL PROFILE GRINDING OR POLISHING MACHINE Filed Feb. 24, 1950 18 Sheets-Sheet '7 mOI fi II wi llllllll lllw:

H W IFL Feb. 12, 1952 F. T. DYER ET AL 2,585,376

PROFILE GRINDING OR POLISHING MACHINE Filed Feb. 24, 1950 18 Sheets-Sheet 8 FIG. IO.

Feb. 12, 1952 F. T. DYER ETAL PROFILE GRINDING OR POLISHING MACHINE 18 Sheets-Sheet 9 Filed Feb. 24, 1950 flare/1 for:

T 0 er eye Raymond A.

Feb. 12, 1952 F. T. DYER ETAL 2,535,376

PROFILE GRINDING OR POLISHING MACHINE Filed Feb. 24, 1950 18 SheetSSheet 1O 33 I40 139 j 7 I55 \35 13s \37 lhven for; freder/c 2'01 er Raymond f1. eye/2" Feb. 12, 1952 F. T. DYEF? ET A; 2,585,376

PROFILE GRINDING OR POLISHING MACHINE Filed Feb. 24, 1950 18 Sheets-Sheet ll Feb. 12, 1952 F. T. DYER ETAL 2,

PROFILE GRINDING OR ousumc MACHINE Filed Feb. 24, 1950 18 Sheets-Sheet 12 ifforney Feb. 12, 1952 F. T. DYER ET AL PROFILE GRINDING OR POLISHING MACHINE l8 Sheets-Sheet Ii. 3

Filed Feb. 24, 1950 Feb. 12, 1952 F. T. DYER ET AL PROFILE GRINDING OR POLISHING MACHINE l8 Sheets-Sheet 14 Filed Feb. 24, 1950 I His. 23.

lnvenfors fi-eder/c T Feb. 12,1952

Filed Feb. 24, 1950 F. T. DYER ET AL PROFILE GRINDING OR POLISHING MACHINE 18 Sheets-Sheet l5 Feb. 12, 195? F. T. DYER ET AL 5 37 PROFILE GRINDING OR POLISHING MACHINE Filed Feb 24, 1950 18 Sheets-Sheet l8 Patented Feb. 12, 1952 IROFILE GRINDING OR POLISHING MACHINE Frederic Thomas Dyer and Raymond Herbert Revett, Ipswich, England, assignors to Ransomes, Sims & .iefferies, Limited, Ipswich, England, a company of Great Britain Application February 24, 1950, Serial No. 146,020 In Great Britain April 12, 1949 17 Claims. 1

The invention relates to a machine especially intended for grinding or polishing the mould. boards of ploughbodies, but it is also capable of being used for grinding or polishing other articles having a varying profile.

An especial object is to avoid the arduous and skilled manual labour hitherto necessary with the use of the usual machine used for grinding or polishing mould boards, which machine cox prises a power driven grinding wheel against which the mould board is manually pressed by means of a cradle on which the mould board is supported, the cradle having a shaft capable sliding and rotating in a bearing so that the cradle can be moved in various directions by means of handles on the cradle and grasped by the operator.

The use of this old machine or appliance quires considerable skill as Well as much arduous manual labour.

A machine according to the invention not only avoids these disadvantages by carrying out the required operations automatically, but it ensures a much increased output.

The machine according to the invention comprises a power driven grinding wheel which is so mounted that it can rise and fall during operation on the article being ground, the article being supported on a work table which is adapted to make reciprocatory traversing movements rela tive to the grinding wheel, and also feeding movements in a direction inclined, for instance, at right angles to the direction of the reciprocatory movements.

In order to ensure that the grinding wheel is maintained normal to the surface being ground, the work table is adapted to be tilted as required by the varying profile of the article being ground, the tilting means being such that adequate resistance of the work to the pressure of the grinding wheel is maintained.

The reciprocation and the tilting of the work table are preferably effected with the aid of hydrauliccylinders, and in order that the grinding wheel can be lowered into and elevated away from its operative position as required, a hydraulic cylinder is preferably provided for this purpose.

Suitable valves for controlling the various hydraulic cylinders and manual and automatic means for operating the valves are provided.

Safety devices are also preferably provided for stopping the machine and ensuring elevation of the grinding wheel to an inoperative position when the machine stops.

The feeding of the work table is preferably effected by mechanism which can be operated manually or by power and this is preferably controlled so that it can be arrested automatically when required.

A particular construction of machine embodying the above features will now be described by way of example with reference to the drawings.

In the drawings- Figure 1 is a side elevation of the whole machine.

Figure 2 is a rear elevation of part of the machine, showing the cylinder for raising thegrinding Wheel and dashpot cylinders.

Figure 2a is a front elevation of the attachment of the vertical screw to the crotch.

Figure 3 is a front elevation of the whole machine partly broken away to show the microswitches.

Figure 4 is a plan of the whole machine.

Figure 5 is a side elevation, looking in the direction of the arrows 55' Figure 4, showing one of the hydraulic cylinders and linkage for tilting the work table and the follower roller and bracket.

Figure 6 is a plan of the tilting cylinder and linkage, with the cylinder in section.

Figure '7 is a sectional elevation showing the traversing table, the double acting hydraulic cylinder for reciprocating it, the feed carriage and the V guides on the base for the feed carriage.

Figure 8 is a plan corresponding with Figure 7, but with the traversing table removed in order to show the rollers on which it reciprocates.

Figure 9 is a fragmentary end sectional elevation on 9'-9, Figure '7.

Figures 10, 11 and 12 are, respectively, a sectional side elevation, a front elevation and a plan of the gear box and self-acting mechanism for driving the feed screw for the feeding carriage, the cover plate of the gear box and the push rod and its lever being omitted in Figure 12'.

Figures 13 and 14 are, respectively, a side elevation and a front elevation of part of the machine, showing the gear box and valve boxes on a larger scale than shown in Figures 1 and 3.

Figure 15 is a plan of the valve box containing the shop and start valve and the wheel elevating valve, the push rod operatively connected with the stop and start valve also being indicated.

Figure 16 is a side elevation as seen in the direction of the arrow I6, Figure 15.

Figure 17 is a sectional plan of the valves on the line lll1, Figure 16.

Figure 18 is a sectional elevation of the valves on the line i8-i3, Figure 15.

Figure 19 is a diagrammatic side elevation illustrating the co-operation of the push rod and coupling cams between the stop and start and wheel elevating valves.

Figures 20 and 21 are, respectively, a front elevation and a side elevation of the valve box containing the reversing valve and the speed control valve for the hydraulic cylinder which reciprocates the traversing table.

Figure 22 is a sectional plan on the line 22-22', Figure 20.

Figure 23 is a sectional elevation on the line 23--23, Figure 22.

Figure 24 is a diagrammatic illustration or flow sheet of the hydraulic system.

Figures 25 and 26 are diagrams indicating the flow when the stop and start valve and the wheel elevating valve are each in two different positions.

Figures 27 and 28 are diagrams indicatin the flow when the reversing valve is in two diii'erent positions.

Figure 29 is a diagram of the electrical connections between the microswitches and the solenoids which operate the traversing table reversing valve.

Figure 30 is a diagram of the electrical connections between the emergency microswitch and the solenoid which closes the stop and start valve should the traversing table accidentally make a stroke of undue length, and also the connections between the emergency microswitch and the motor starter.

Figure 31 is a sectional elevation of a relief valve.

Figures 32 and 33 are a front elevation and a plan, respectively, of jigs or supports for fixing a mould board on the work table.

Figure 34 is a diagrammatic plan of a mould board, and

Figure 35 is a diagrammatic side view illustrating the mode of grinding.

In the machine illustrated by the drawings, a grinding or polishing wheel 1, Figures 1 to 4, is secured to one end of a spindle 2, which is mounted to rotate in a bearing housing 3, which may be fitted with ball bearings of any approved type, not illustrated.

The bearing housing 3 is pivotally mounted, that is, it has trunnions mounted to rotate in a crotch 5, so that the spindle 2 can oscillate in a vertical plane. The crotch 5 is fixed on a vertical slide 6, which slides in guides 1 on the front of a stationary column 3.

Means for varying the height of the pivotal support for the bearing housing for the purpose of varying the initial height of the grinding wheel i to suit the size of the grinding wheel or of the article being ground, comprises a screw threaded shaft 3, Figures 1 and 2a, having a boss l0 secured to its upper end and screwed to the bottom of the crotch 5. A nut H in engagement with the screw threaded shaft 3 is mounted to rotate against the ball thrust bearings 12.

The exterior of the nut H is formed as a worm wheel and is in engagement with a worm 13 on a cross-shaft I6 having a hand wheel 15, rotation of which effects the raising or lowering of the crotch 5.

The spindle 2 of the grinding wheel 1 extends beyond the bearing housing 3 and is fitted with a V grooved pulley l6 driven by belts 11 from a pulley 18 on the shaft of an electric motor 19 4 mounted on a bracket 28 fixed to the upper side of the bearing housing 3.

Means for counterbalancing the electric motor 19 and for varying the downward pressure of the grinding wheel l comprise weights 2! and 22, carried by a rod 23 supported by brackets 24, 24 fixed to the bearing housing 3.

The weight 22 can be slidden along the rod 23 to vary the downward pressure of the grinding wheel I, by means of a screwed shalt 22', engaging within a screw threaded hole 23' in the weight 22, the shaft 22 being mounted to rotate in the brackets 24., 24 and being provided with a handle 24', Figure 4.

Two hydraulic cylinders 25 and 25, Figures 1 and 2, are pivotally mounted at their lower ends on a pivot pin 21, which is carried by a bracket 28 fixed on the base 29 of the column 3. The piston rods 3! and 3| of the cylinders 25 and 26, respectively, are pivotally connected with the bearing housing 3 by a pivot pin 32, 32', carried by a bracket 33 fixed to the bearing housing.

The hydraulic cylinder 25 is equipped to act as a dashpot to cushion the oscillations of the bearing housing 3 and, therefore, of the grin-ding wheel I during operation. A pipe 212 connects the two ends of the cylinder 25, so that low pressure oil can be displaced from one side of the piston 213 to the other. Low pressure oil from any convenient source can be supplied to the pipe 212 through the union 214. The hydraulic cylinder 25, conveniently termed the elevating cylinder, is used to raise the grinding wheel from its operative position into an inoperative position, when required.

The means for controlling these cylinders will be described later on.

A work table 34, Figures 1, 3, 4, 5 and 6 for supporting the article to be ground, is pivotally mounted by trunnions 35, 35, supported by brackets 31, 31, fixed to a traversing table 38, which reciprocates or traverses on V slides 33 and rollers 45 on a feed carriage 4i. Some of these parts are shown more clearly in Figures 5 to 9.

A mould board 35 for a plough body is only indicated in dotted lines in Figures 1 and 3. Means for fixing it on the work table are described later The reciprocation of the traversing table 38 is effected by a double acting hydraulic cylinder 42, which is fixed to the feed carriage il by eye-bolts or clamps 43, Figure 7. The rod 44 of the piston 45 of the cylinder :32 is connected at its ends to brackets 46 screwed to the traversing table 38. The control of pressure fluid to and from the cylinder w ll be referred to later.

The pivoted work table 34 is tilted by hydraulic cylinders 41, Figures 1, 3, 4, 5 and 6, which are pivotally mounted on trunnions 48 in forked brackets 49 fixed on the brackets 31, 31.

Each cylinder 41 has a piston 50, Figure 6, one end of the rod 5| of which is fixed in a fork 52 carrying a pivot pin 53 for the adjacent ends of links 54, 54, and for the adjacent end of a lever 55. The other ends of the links are pivotally connected by a. pivot pin 56 to a lever 51 fixed on the adjacent trunnion 36 of the work table 34. A compression spring 58 is provided in each cylinder 41, which is compressed by the piston 50 when it is forced in one direction by pressure fluid to tilt the work table upwards by means of the links 54 and lever 51, the spring 58 assisting the return of the piston when the pressure fluid is released and the work'table is to be tilted 

